Spectral filtration of XUV radiation with the help of thin film filters in the TEREK-C solar telescope and RES-C spectroheliograph

Alexander V. Mitrofanov; Fedor A. Pudonin; N. Starodubzev; Igor A. Zhitnik

doi:10.1117/12.310982

25 June 1998 Spectral filtration of XUV radiation with the help of thin film filters in the TEREK-C solar telescope and RES-C spectroheliograph

Alexander V. Mitrofanov, Fedor A. Pudonin, N. Starodubzev, Igor A. Zhitnik

Author Affiliations +

Proceedings Volume 3406, Current Russian Research in Optics and Photonics: New Methods and Instruments for Space- and Earth-based Spectroscopy in XUV, UV, IR, and Millimeter Waves; (1998) https://doi.org/10.1117/12.310982
Event: Current Russian Research in Optics and Photonics: New Methods and Instruments for Space- and Earth-Based Spectroscopy in XUV, UV, IR, 1998, none, Russian Federation

Abstract

The characteristics of different types of thin film XUV filters for the TEREK-C solar telescope and the REC-C spectroheliograph developed in the framework of the CORONAS-I program are presented. We describe the design and properties of Al-Formvar composite filters on rigid mesh supports with a spacing of 0.7 mm and 2 mm, which have been mounted in front of the XUV spectral channels of both instruments. It was proposed to use thin films of SiC as bandpass filters with high transparency in the 13 - 30 nm spectral region and effective cutoff blocking of strong solar L_α (121.7 nm) line radiation. The Al and SiC thin films on fine porous polymer membranes with through pores were placed in close proximity of the entrance plane of the image detectors, designed as a combination of open type microchannel plate and CCD-matrix. The problem of elimination of the influence of diffraction effects on X-ray images in the telescope focal plane is considered. All filters have sustained without damage the launching overloads (the launch took place on March 12, 1994) and successfully worked in the TEREK-C and the RES-C instruments.

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Alexander V. Mitrofanov, Fedor A. Pudonin, N. Starodubzev, and Igor A. Zhitnik "Spectral filtration of XUV radiation with the help of thin film filters in the TEREK-C solar telescope and RES-C spectroheliograph", Proc. SPIE 3406, Current Russian Research in Optics and Photonics: New Methods and Instruments for Space- and Earth-based Spectroscopy in XUV, UV, IR, and Millimeter Waves, (25 June 1998); https://doi.org/10.1117/12.310982

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